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+What: /sys/class/mdio_bus/<bus>/<device>/attached_dev
+Date: May 2017
+KernelVersion: 4.13
+Contact: netdev@vger.kernel.org
+Description:
+ Symbolic link to the network device this PHY device is
+ attached to.
+
+What: /sys/class/mdio_bus/<bus>/<device>/phy_has_fixups
+Date: February 2014
+KernelVersion: 3.15
+Contact: netdev@vger.kernel.org
+Description:
+ Boolean value indicating whether the PHY device has
+ any fixups registered against it (phy_register_fixup)
+
+What: /sys/class/mdio_bus/<bus>/<device>/phy_id
+Date: November 2012
+KernelVersion: 3.8
+Contact: netdev@vger.kernel.org
+Description:
+ 32-bit hexadecimal value corresponding to the PHY device's OUI,
+ model and revision number.
+
+What: /sys/class/mdio_bus/<bus>/<device>/phy_interface
+Date: February 2014
+KernelVersion: 3.15
+Contact: netdev@vger.kernel.org
+Description:
+ String value indicating the PHY interface, possible
+ values are:.
+ <empty> (not available), mii, gmii, sgmii, tbi, rev-mii,
+ rmii, rgmii, rgmii-id, rgmii-rxid, rgmii-txid, rtbi, smii
+ xgmii, moca, qsgmii, trgmii, 1000base-x, 2500base-x, rxaui,
+ xaui, 10gbase-kr, unknown
+